VizieR

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VizieR

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The 5 columns in color are computed by VizieR, and are not part of the original data.
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Name

RAB1950
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bmag
mag
Nfields

Flag1

Flag2

Flag3

_RA.icrs
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_DE.icrs
"d:m:s"
1 1.22604 09 10.29113+21 26 24.7037+21.013604 06 13.476+21 18 33.0616.08100004 09 10.291+21 26 24.70
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USNO-A2.0 contains 526,280,881 sources, and is based on a re-reduction of the Precision Measuring Machine (PMM) scans from POSS-I O and E plates (>=-18°) and SRC-J and ESO-R plates (<=-20°). USNO-A2.0 was created by Dave Monet () and collaborators at Flagstaff Station, U.S. Naval Observatory.
The major difference between USNO-A2.0 and its previous version USNO-A1.0 is that A1.0 used the Guide Star Catalog as its reference frame whereas A2.0 uses the ICRF as realized by the USNO ACT catalog (Urban et al. 1997). The VizieR search engine uses an on-line compressed version (3.6Gbytes) which was generated at CDS.

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USNO-A2.0

RAJ2000
deg
DEJ2000
deg
ACTflag

Mflag

Bmag
mag
Rmag
mag
Epoch
yr
1 1.46504 09 10.28880+21 26 25.13041050-01157996062.292870+21.440314    14.711.81950.936
2 4.21904 09 10.33152+21 26 20.07241050-01158001062.293048+21.438909    18.317.21950.936
%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20The%20%3cB%3eGuide%20Star%20Catalog%20has%20been%20constructed%20to%20support%20the%20%0aoperational%20need%20of%20the%20Hubble%20Space%20Telescope.%0aIt%20contains%20over%2025%20million%20positions%20for%20about%2019%20million%0aobjects,%20of%20which%20more%20than%2015%20million%20are%20classified%20as%20stars.%0aThe%20version%20%3cB%3e1.2%20is%20a%20new%20astrometric%20reduction%20which%20results%20in%0aabsolute%20position%20errors%20about%200.3-0.4%20arcsec.%0a%28see%20GSC%20pages%20at%20URL%20http://www-gsss.stsci.edu/gsc/gsc.html%29%0a%3cP%3e%0a
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GSC

RAJ2000
deg
DEJ2000
deg
PosErr
arcsec
Pmag
mag
e_
mag
n_

Class

Plate

Epoch
yr
1 1.1804 09 10.2912+21 26 24.5400126300213062.29288+21.44015 0.314.09 0.40 10000O1982.875
2 1.2604 09 10.2840+21 26 24.4680126300213062.29285+21.44013 0.313.54 0.40 1000EK1983.017

Note: The GSC-ACT (or GSC1.3) is a recalibration of the GSC1.1, the catalogue constructed to support the operational need of the Hubble Space Telescope, with the ACT, the combination of the Astrographic Catalogue and the Tycho catalogue derived from the Hipparcos mission; see http://www.projectpluto.com/gsc_act.htm for more details about this recalibration.

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GSC

RAJ2000
deg
DEJ2000
deg
PosErr
arcsec
Pmag
mag
e_
mag
n_

Class

Epoch
yr
1 0.9804 09 10.3032+21 26 24.3960126300213062.29293+21.44011 0.314.11 0.40 101982.875
2 1.5804 09 10.2768+21 26 25.0800126300213062.29282+21.44030 0.313.57 0.40 101983.017
%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20%3cB%3e%3cFONT%20COLOR=%27#CD5B45%27>%20The%20current%20version%20includes%20only%20the%20North%20%28POSS-I%20plates%29%3cP%3e%0a
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APM-ID

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rClass

rStel

rDiam
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rEll

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bClass

bStel

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mag
Mflag

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Mflag

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1.39404 09 10.28688+21 26 24.9612EO0031-0475724062.292862+21.440267 9.33   1 18.44 30.5 0.1613.30   2 46.25 25.5 3.97   22.30904 09 10.09872+21 26 46.2300EO0031-0475473062.292078+21.44617519.89   1 3.49 5.0 0.5721.52L 0     1.63  
%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20The%20construction%20of%20the%20%0a%3cB%3eGSC-II%20%0ais%20still%20in%20progress:%20this%0aversion%20has%20no%20proper%20motions,%20and%20the%20magnitude%20limits%20are%2018.5%20in%20F%20%28red%29%0aand%2019.5%20in%20J%20%28blue%29.%20The%20data%20are%20%3cB%3e%3cFONT%20COLOR=%27#0000CD%27>copyrighted,%20check%20%0athe%20%3cB%3edata%20use%20Policy.%0a%3cP%3e%0a
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GSC2.2

RA(ICRS)
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DE(ICRS)
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Epoch
yr
Rmag
mag
e_
mag
Bjmag
mag
e_
mag
Class

a
pix
e

1 1.14404 09 10.30296+21 26 24.8496N3022001468062.292929+21.4402361989.97311.32 0.3913.10 0.390 11.87 0.18
%0a%0a%3cP%3e%0a%3cFONT%20SIZE=%27-1%27%3e%3cEM%3e%3cFONT%20COLOR=%27#0000FF%27>%3cB%3eNote:%20The%20%3cB%3eUSNO-B%20Catalog%20presents%20positions,%20proper%20motions,%20%0amagnitudes%20un%20blue,%20red%20and%20infrared,%20as%20well%20as%20star/galaxy%20estimators%0afor%201,045,175,762%20objects%20derived%20from%203,648,832,040%20separate%20observations.%0aThe%20data%20were%20taken%20from%20scans%20of%207,435%20Schmidt%20plates%0ataken%20from%20various%20sky%20surveys%20during%20the%20last%2050%20years.%3cBR%3e%0aUSNO-B1.0%20catalog%20was%20created%20by%20Dave%20Monet%20and%20collaborators%0aat%20http://www.nofs.navy.mil/data/fchpix/%20%3cBR%3e%0a%3cB%3e%3cFONT%20COLOR=%27#EE0000%27>%20Note%20that%20the%20star/galaxy%20estimators%20may%20be%20mixed%20up%0a%20in%20dense%20regions.%0a%3cP%3e%0a